The Research Of Directly-driven PMSG Wind Power Generation System

With the worsening of the global energy crisis and environmental issues of new energy, wind, solar and other renewable energy, is represented by increasing development needs of modern society. Compared to traditional wind power generation systems, Direct-drive Permanent Magnet Synchronous Generator(PMSG) wind power system has a multi-polar low-speed generator, thus eliminating the growth gearbox, reducing maintenance costs, improved reliability, and the rotor magnetic field orientation high-performance vector control strategies is employed, Variable Speed Constant Frequency(VSCF) method greatly improves the wind energy utilization, in line with the development of wind power system, high efficiency, high capacity, high reliability requirements. Therefore, Direct-driven Permanent Magnet Synchronous Generator wind power generation systems are gradually get people's attention. In this paper, the topology of the direct drive wind generator systems and discusses the simulation of wind power wind turbine design and the use of Hill Climbing Search (HCS) algorithm for Maximum Power Point Tracking (MPPT), established a set of simulation and experimental platform, the corresponding simulation and experimental verification.Three common topology of full-power direct-drive wind power systems is introduced in this article:PWM rectifier+voltage PWM inverter topology, Three-Phase commutator+Boost converter topology, Six-phase permanent magnet synchronous generator+Three-Phase commutator+Boost converter topology, the maximum wind energy capture characteristics under different wind conditions, network voltage drop under the conditions of wind turbine transient process were compared to discuss in Matlab/Simulink simulation. The advantage of the rectifier+ voltage type PWM inverter topology is discussed, and this topology is used as the main research object.Study the control strategies of wind power generation under the experimental conditions do not have the wind field environment, which can only be discussed in the theoretical analysis and simulation, algorithm cannot verify by experiment. To solve this problem, this paper proposes the use of host computer by Lab VIEW to control the operation of the inverter induction motor work, to simulate the actual output torque of the wind turbine. Induction motor instead of the actual wind turbine to drive the wind turbine generation, and the motor side of the control strategy is discussed. On this basis, Maximum Power Point Tracking (MPPT) strategy is designed based on climbing search algorithm. Finally, the use of laboratory simulation of wind turbine output of 1.5kW prime mover drag 750W permanent magnet generator to experiment, to obtain a more satisfactory experimental results to verify the simulation of wind turbine output of the inverter-based asynchronous machine, and the MPPT algorithm the feasibility and practicality.